Accessory mineral chemistry as a monitor of petrogenetic and metallogenetic processes: A comparative study of zircon and apatite from Wushan Cu- and Zhuxiling W(Mo)-mineralization-related granitoids

Duan, Xiaoxia; Chen, Bin; Sun, Keke; Wang, Zhiqiang; Yan, Xiang; Zhang, Zhen

doi:10.1016/j.oregeorev.2019.102940

Cited by 22 publications

(7 citation statements)

References 112 publications

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“…This preference for Eu 3+ and Ce 3+ versus Eu 2+ and Ce 4+ in the apatite structure may lead to anomalies in the contents of both elements when compared to the other (trivalent) REEs [15], and the Eu and Ce anomalies in apatite may reflect the fO 2 conditions of melts [9,10,15,132]. Accordingly, reducing environments would lead to high Eu 2+ /Eu 3+ ratios with pronounced Eu-negative anomalies in apatite, whereas oxidizing conditions would be associated with no or positive Eu anomalies [6,7,[9][10][11]15,109,128,[132][133][134]. A negative Eu anomaly has been postulated to increase with melt evolution ( [10]).…”

Section: Eu and Ce Anomalies In Apatitementioning

confidence: 99%

Compositional Variations in Apatite and Petrogenetic Significance: Examples from Peraluminous Granites and Related Pegmatites and Hydrothermal Veins from the Central Iberian Zone (Spain and Portugal)

et al. 2022

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Apatite can be used as an archive of processes occurring during the evolution of granitic magmas and as a pegmatite exploration tool. With this aim, a detailed compositional study of apatite was performed on different Variscan granites, pegmatites and quartz veins from the Central Iberian Zone. Manganese in granitic apatite increases with increasing evolution degree. Such Mn increase would not be related to changes in the fO2 during evolution but rather to a higher proportion of Mn in residual melts, joined to an increase in SiO2 content and peraluminosity. In the case of pegmatitic apatite, the fO2 and the polymerization degree of the melts seem not to have influenced the Mn and Fe contents but the higher availability of these transition elements and/or the lack of minerals competing for them. The subrounded Fe-Mn phosphate nodules, where apatite often occurs in P-rich pegmatites and P-rich quartz dykes, probably crystallized from a P-rich melt exsolved from the pegmatitic melt and where Fe, Mn and Cl would partition. The low Mn and Fe contents in the apatite from the quartz veins may be attributed either to the low availability of these elements in the late hydrothermal fluids derived from the granitic and pegmatitic melts, or to a high fO2. The Rare Earth Elements, Sr and Y are the main trace elements of the studied apatites. The REE contents of apatite decrease with the evolution of their hosting rocks. The REE patterns show in general strong tetrad effects that are probably not related to the fluids’ activity in the system. On the contrary, the fluids likely drive the non-CHARAC behavior of apatite from the most evolved granitic and pegmatitic units. Low fO2 conditions seem to be related to strong Eu anomalies observed for most of the apatites associated with different granitic units, barren and P-rich pegmatites. The positive Eu anomalies in some apatites from leucogranites and Li-rich pegmatites could reflect their early character, prior to the crystallization of feldspars. The increase in the Sr content in apatite from Li-rich pegmatites and B-P±F-rich leucogranites could be related to problems in accommodating this element in the albite structure, favoring its incorporation into apatite. The triangular plots ΣREE-Sr-Y and U–Th–Pb of apatites, as well as the Eu anomaly versus the TE1,3 diagram, seem to be potentially good as petrogenetic indicators, mainly for pegmatites and, to a lesser extent, for granites from the CIZ.

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Section: Eu and Ce Anomalies In Apatitementioning

confidence: 99%

Compositional Variations in Apatite and Petrogenetic Significance: Examples from Peraluminous Granites and Related Pegmatites and Hydrothermal Veins from the Central Iberian Zone (Spain and Portugal)

et al. 2022

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“…The increases in zircon Yb/Gd of the Mengshan granites could have resulted from apatite fractionation, with preferential removal of middle REE (Sm and Gd) from the melt compared to LREE and HREE (Lee et al, 2017). Fractional crystallization of plagioclase also would decrease the (Eu/Eu * ) N ratios in zircon (e.g., Lee et al, 2017;Duan et al, 2019;Zhang et al, 2020a). Furthermore, the Nb/Ta ratios in zircon were largely controlled by their contents in the magmatic melts (e.g., Jiang et al, 2019); thus, the Nb/Ta ratio in both magmatic melts and zircons would decrease with magmatic evolution due to the fractionation of biotite (Stepanov et al, 2014).…”

Section: Evolutionary Process Zircon Chemistry As An Indicator Of Magmatic Evolution and Melt-fluid Interactionmentioning

confidence: 99%

Petrogenesis, Redox State, and Mineralization Potential of Triassic Granitoids in the Mengshan District, South China

et al. 2021

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The Mengshan district is located in the eastern segment of the Jiangnan Orogen in South China. Multi-phase intrusions were emplaced in this district, with the medium-grained porphyritic biotite granite and its marginal phase (fine-grained porphyritic biotite granite) genetically related to metal and non-metal mineralization. In this study, zircon U–Pb ages and trace elements, whole-rock geochemistry, and Nd isotopes were systematically analyzed for medium- and fine-grained porphyritic biotite granite in the Mengshan district, with the aim of elucidating the origin, evolutionary process, redox state, and mineralization competency of the studied granites. The Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA–ICP–MS) zircon U–Pb dating provided a weighted mean age of 226.6 ± 0.5 to 225.9 ± 0.5 Ma for the studied Mengshan granites, synchronous with the late-episode Triassic magmatism-mineralization in South China. The studied Mengshan granites are high-Si and -K, low-P, and weakly peraluminous, exhibiting features of highly evolved I-type granites. The detailed whole-rock geochemistry and Nd isotopes, and zircon trace elements and Hf isotopes demonstrated that the studied Mengshan granites were likely derived from disequilibrium melting of Proterozoic metamorphic basements that were composed of meta-igneous and metasediments and underwent fractional crystallization of plagioclase, K-feldspar, biotite, Fe-Ti oxide, zircon, and apatite. Low whole-rock K/Rb (<150), Nb/Ta (<6), and Zr/Hf (<26) ratios and the metasomatized rim of zircon also suggest that the melt–fluid interaction occurred during the formation of more evolved fine-grained porphyritic biotite granite. The Mengshan granites have a relatively reduced redox state, revealed by their relatively low whole-rock Fe2O3/FeO ratios (mostly < 0.5), zircon Ce4+/Ce3+ ratios (mostly lower than 90), and oxygen fugacity (below ΔFMQ + 1.4). The data in this study indicate that the Mengshan granites, especially the more evolved fine-grained porphyritic biotite granite, are favorable for W, Sn, Mo (<0.3 Mt), and Cu (<1 Mt) mineralization. Moreover, the contact zone between the fine-grained porphyritic biotite granite (or other Triassic granites) and the Permian Maokou Formation (flint-nodule limestone) is a potential target region for wollastonite exploration.

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“…Pan and Fleet, 2002 ) (Belousova et al, 2002;Pan and Fleet, 2002;Sha and Chappell, 1999) . Numerous studies have shown that reducing conditions result in negative Eu ano malies in apatite (Belousova et al, 2002;Cao et al, 2012;Chu et al, 2009;Ding et al, 2015;Duan et al, 2019;Pan and Fleet, 2002;Sha and Chappell, 1999;J. Xie et al, 2018;Zafar et al, 2019 ).…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, Ce anomalies in apatite are assumed to be relatively independent of the effects of crystallisation of other phases, with the exception of zircon or accessory REE -rich phases . Although apatites variably show positive Ce anomalies, inferred to represent varying degrees of magmatic oxidation, the extent of these are small (Belousova et al, 2002;Chu et al, 2009;Ding et al, 2015;Duan et al, 2019 ). In notable contrast to zircon which can exhibit significant positive Ce anomalies in REE data (Trail et al, 2012) , there has been no robust experimental assessment of the extent to which REE anomalies in apatite can be used to probe magmatic fO 2.…”

Section: Introductionmentioning

confidence: 99%

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Do concentrations of Mn, Eu and Ce in apatite reliably record oxygen fugacity in magmas?

Bromiley

2021

Lithos

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Accessory mineral chemistry as a monitor of petrogenetic and metallogenetic processes: A comparative study of zircon and apatite from Wushan Cu- and Zhuxiling W(Mo)-mineralization-related granitoids

Cited by 22 publications

References 112 publications

Compositional Variations in Apatite and Petrogenetic Significance: Examples from Peraluminous Granites and Related Pegmatites and Hydrothermal Veins from the Central Iberian Zone (Spain and Portugal)

Compositional Variations in Apatite and Petrogenetic Significance: Examples from Peraluminous Granites and Related Pegmatites and Hydrothermal Veins from the Central Iberian Zone (Spain and Portugal)

Petrogenesis, Redox State, and Mineralization Potential of Triassic Granitoids in the Mengshan District, South China

Do concentrations of Mn, Eu and Ce in apatite reliably record oxygen fugacity in magmas?

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